Custom border extrapolation of ShapedImageNeighborhoodRange by ImageNeighborhoodPixelAccessPolicy

Engineering
25

Thanks Niels, crystal clear, I think I understood correctly the first time, but always appreciate the extra examples! :blush:

So, better than talking, going directly for the code (simplified):

template <typename TImage>
class ConstantBoundaryImageNeighborhoodPixelAccessPolicy final
{
//......... Appending to all the good stuff already there ...... //
public:
  void SetConstant(const PixelType & inputValue) {m_Constant = inputValue; }
}

No new template parameter in Range:

template<typename TImage, typename TImageNeighborhoodPixelAccessPolicy >
class ShapedImageNeighborhoodRange final:
{
// ........ Appending .... //
TImageNeighborhoodPixelAccessPolicy & GetReferencePixelAccessPolicy() { return m_PixelAccessPolicy;}
}

The usage:

// The equivalent in ITK 5.0 + this patch +  this
// Using itk::Experimental::ShapedImageNeighborhoodRange:
using RangeType = ShapedImageNeighborhoodRange< ImageType,
ConstantBoundaryImageNeighborhoodPixelAccessPolicy<ImageType> >;

RangeType range{ *image, location, offsets}; // same constructor as before
range->GetReferencePixelAccessPolicy()->SetConstant(paddingValue); // we set the value at run time on the policy

Let me know what you think,
Cheers

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